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Research on Formation Characteristics and Detection Method of Trihalomethane in Chlorine and Chloramine Disinfection

Author: ZhangWeiWei
Tutor: LiGuiBai
School: Qingdao Technological University
Course: Municipal Engineering
Keywords: Drinking water Trihalomethanes Chlorine Chloramine
CLC: TU991.2
Type: Master's thesis
Year: 2010
Downloads: 122
Quote: 0
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Abstract


Disinfection is an important part of the drinking water treatment process is the final guarantee of the residents of safe drinking water, sanitation. Free chlorine disinfection to play a major role in the control of the water mediated viral diseases epidemic in low-cost, good effect, easy to use, and other advantages, to become the most widely used disinfection technology at home and abroad waterworks. Since the formation of disinfection byproducts chlorine disinfection process, the formation of certain hazards to human health, drinking water disinfection byproducts become the hotspot of the world drinking water disinfection industry, alternative disinfectants and their combined process The study has also become an important measure to protect the safety of drinking water quality. This study is very important to control disinfection byproducts in drinking water, to provide high-quality water supply, protect the water security of residents. Water water pollution situation in China, and the existing health standards for drinking water, conducted a comprehensive review and analysis of the current situation and development of drinking water disinfection technology and its problems of disinfection byproducts. Certain improvements in the existing trihalomethanes standard detection methods based on liquid-liquid extraction - gas chromatography (ECD) combined with technology, the establishment of a fast, accurate and effective analysis method of trihalomethanes; identified chloroform bromodichloromethane, dibromochloromethane methane and bromoform four substances standard curve, and the quality control of the four components were analyzed, provides for the accurate determination of the generation amount of the of trihalomethanes class DBPs the necessary methods. Our existing water quality characteristics, humic acid as a precursor mimics natural waters disinfection byproducts, and background of bromide ion solution, chlorine and chloramines disinfection process reaction trihalomethanes generate the impact of the situation, and discusses the generation characteristics of trihalomethanes. The test results show that the trihalomethanes formation chlorine disinfection with chlorine dosage, the concentration of organic matter, pH, water temperature, the bromide ion concentration and reaction time increases with increasing trihalomethane formation and TOC between more significant linear relationship. It was found that the chloramine disinfection can greatly reduce the chlorine disinfection byproduct. Using chloramine disinfection, the amount of trihalomethane formation with chloramine dosage, Cl / N, the concentration of organic matter, the temperature, the bromide ion concentration and the reaction time increases, with the increase of the pH decrease, wherein trihalomethyl Methane formation was a linear relationship between chloramine dosage. But overall, trihalomethane class disinfection byproducts generated chloramine disinfection is weak, not changing the reaction conditions on the amount of trihalomethane formation only when a substantial increase in the ratio of chlorine and ammonia, trihalomethane formation The amount will have a larger increase.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
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